i only buy gen 4's. i like the grip better.
but i have to say, if you can find a rtf2 gen 3.5 get it. that is the best glock ive tried. the grip shape feels diferent than my gen 4 with and without 1 backstrap, and the rtf is amazing. some complain its too grippy, but i dont find that.

Maybe Im stubborn but I just can't get into the Gen4's. Don't like the way they look or feel compared to the Gen3's. To me it was Glock fixing something that wasn't broken. For me and my tastes, it's the Gen3's all the way.

I have been spending alot of time at my local gun hangout fondling the Gen4's trying to get into them vs my beloved Gen3's. They are growing on me and it appears that Glock has worked out the bugs on them. I may have break down and pick up a
Gen4 22 or 35. I will just refer to it as the Red Headed step child of the bunch.....lol '

I've had a few Gen3 Glocks, a friend has a gen4 G19 he has easily put a few thousands rounds through it with no issue. It will likely be my next gun, unless I get a Sig. I've read here that people have been having issues with these guns, folks that I shoot with have had no issues yet.

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poor gas mileage gets you to the best places on earth

I have yet to shoot a Gen4 (or SF model for that matter) that had a trigger that felt as good as a Gen3 trigger. I don't know what the heck Glock did to the triggers when they switched to the Gen4, but the trigger feels like there is a lot more travel from the point that the trigger bar contacts the striker than on the Gen3, almost mushy to the point that it breaks. Then Gen3 guns feel like the point of engagement to the point of break is much shorter and crisper. Maybe I have just handled a lot of Gen4 and SF guns that have come out of the factory with poor triggers.

Personally, I am sticking with Gen3 guns as long as I can still buy them. If I wanted a striker fired pistol with a mushy trigger I can get a Springfield XD for a bit less money.